Rated 4 out of 5 stars

Very cool. I'd make two suggestions if you are actively updating this.

* Highlight the url bar after page load. After installing this addon, I need to explicitly click the url bar before typing.* Perhaps the thumbnails would be more recognizable if it was only the top left quarter of what you currently show. That's usually where the identifiable title or logo is.

It also may be interesting to see how websites relate to each other. For instance 40 times out of 90 I go to website X from website Y, so when I open a new tab from website Y, website X should be right below my cursor. Just a thought, I have no idea if its useful or possible.